In
physics, the
angular velocity is defined as the rate of change of
angular displacement and is a
vector quantity (more precisely, a
pseudovector) which specifies the angular speed (
rotational speed) of an object and the axis about which the object is rotating. This speed can be measured in the
SI unit of angular velocity,
radians per second, or in terms of degrees per second, degrees per hour, etc. Angular velocity is usually represented by the symbol
omega (
ω, rarely
Ω).